Login screen with dual monitors in Ubuntu 17.10
If you use Ubuntu 17.10 with dual monitors you’ll notice that the login screen won’t keep the same settings as your desktop. The workaround goes like this:
Login and set up the displays as you please, using the settings control panel. Then, run the following commands on a terminal:
sudo cp ~/.config/monitors.xml /var/lib/gdm3/.config/
sudo chown gdm.gdm /var/lib/gdm3/.config/monitors.xmlAnd reboot. You’ll have your login screen with the same settings as your desktop.